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首页> 外文期刊>Marine ecology progress series >Resource utilization of puffer fish in a subtropical bay as revealed by stable isotope analysis and food web modeling
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Resource utilization of puffer fish in a subtropical bay as revealed by stable isotope analysis and food web modeling

机译：稳定同位素分析和食物网模拟揭示了亚热带海湾河豚的资源利用

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Estuaries often comprise a habitat mosaic, the connectivity of which depends in part on mobile organisms that move in between habitats for feeding and breeding. We assessed resource utilization by 2 co-existing puffer fish species, Sphoeroides testudineus and Sphoeroides greeleyi, in mangroves, saltmarshes and shallow subtidal channels of a subtropical bay. We hypothesized that puffer fish migrate into mangroves mainly to feed and that the coexistence of the 2 species may be explained by differences in resource utilization and/or by a differential preference for different foraging grounds. We combined a stable isotope approach with an Ecopath model that contrasted detritus-driven and herbivory-driven foodweb scenarios. The most parsimonious foodweb scenario involved the feeding of puffer fish on benthic invertebrates associated with Spartina marshes. This emphasizes the importance of saltmarshes as feeding grounds for both puffer fish species, independently of where they were sampled. Small differences in isotopic signatures between S. greeleyi and S. testudineus indicated major resource overlap, but also some degree of food partitioning probably through the selection of differently sized prey. The smaller S. greeleyi consistently had a slightly higher trophic level than the larger S. testudineus. S. testudineus had larger isotopic niche sizes as a consequence of greater inter-individual variation in resource use. Our results emphasize the importance of considering multiple habitats and foodweb scenarios when investigating resource use and species interactions in estuarine ecosystems.
机译：河口通常包括一个栖息地马赛克，它们的连通性部分取决于在栖息地之间移动以觅食和繁殖的移动生物。我们评估了亚热带海湾的红树林，盐沼和浅潮下河道中两种共存的河豚鱼Sphoeroides testudineus和Sphoeroides greeleyi对资源的利用。我们假设河豚主要迁移到红树林中觅食，并且这两种物种的共存可以通过资源利用的差异和/或对不同觅食地的偏爱来解释。我们将稳定同位素方法与Ecopath模型相结合，该模型将碎屑驱动和食草驱动的食物网场景进行了对比。最简约的食物网场景涉及在与斯巴蒂娜沼泽相关的底栖无脊椎动物上喂河豚。这强调了盐沼作为两种河豚鱼取食场的重要性，而与它们的取样地点无关。 S. greeleyi和S. testudineus之间的同位素特征小的差异表明主要的资源重叠，但也可能通过选择大小不同的猎物而在某种程度上划分了食物。较小的格力链球菌的营养水平始终高于较大的睾丸链球菌。由于资源使用的个体间差异较大，S。testudineus的同位素位点尺寸较大。我们的结果强调了在调查河口生态系统中的资源使用和物种相互作用时，考虑多种生境和食物网情景的重要性。

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